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Helically wound types with heatshrink covering can be a bit difficult to identify, but someone may recognise a model. They can be for anywhere over the HF range, and typically the longer ones for lower frequencies, shorter ones for higher e.g. 5 feet or less usually for 27/28MHz.

Other than recognising a model, the only sure way to determine the frequency would be to connect an antenna to a mount (e.g. on a vehicle) or ground plane and use an antenna analyser.